Webster’s Revised Unabridged Dictionary · 1913
Uranin
U′ra·nin (ū′rȧ·nĭn), n. (Chem.) An alkaline salt of fluorescein, obtained as a brownish red substance, which is used as a dye; — so called from the peculiar yellowish green fluorescence (resembling that of uranium glass) of its solutions. See Fluorescein.